Hehe, I don't know if you are a sailor or what occupation. If you are a sailor, there are some special training examinations in the school. Such as chart operation evaluation and route design evaluation. Is to cultivate students with these abilities.

These two trainings will take two weeks.

There is a lot of information about sailing. It's not just nautical notices, cumulative tables, route guides. There are also world ocean routes, radio signal tables, light fog tables, monthly route design drawings and so on. .

These materials must be equipped on the ship. If you want to buy it, just go to the aviation insurance department. Some cities have agency stations.

If you look it up, it's hard to say a word or two clearly. It needs systematic training.